CLINTON, Mo. — A second man has been arrested in connection with last weekend’s shooting death of a western Missouri police officer, authorities said Thursday evening.

Missouri State Highway Patrol Sgt. Bill Lowe said William Noble, 35, of Clinton was taken into custody Thursday and charged with felony tampering with evidence.

During the course of an interview, Lowe said, investigators determined that Noble had disposed of the rifle believed to have been used in Sunday’s shooting death of Clinton police Officer Gary Michael.

Lowe earlier said that a gun had been found in a creek about two miles north of Clinton. Lowe did not specify the style of the rifle found or how investigators came to find it.

Ian McCarthy, 39, is charged with first-degree murder and armed criminal action in Michael’s death. He was arrested late Tuesday after a two-day manhunt.

Lowe said that the relationship between McCarthy and Noble was unclear.

McCarthy’s public defender, Alice Wasson, told The Associated Press that a not guilty plea will be entered on McCarthy’s behalf during a court appearance Friday.

Michael, 37, had been on the force less than a year and was the first police officer killed in the line of duty in Clinton, a town of about 9,000 people about 75 miles (120 kilometers) southeast of Kansas City.